Which of the following statements is $CORRECT$?

  • A
    $Li$ is harder than the other alkali metals.
  • B
    In the $Solvay$ process,$NH_3$ is recovered when the solution containing $NH_4Cl$ is treated with $Ca(OH)_2$.
  • C
    $Na_2CO_3$ is known as pearl ash.
  • D
    Beryllium and aluminium ions do not have a strong tendency to form complexes like $[BeF_4]^{2-}$ and $[AlF_6]^{3-}$.

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